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C. N. HUDSON.

GRADER.

APPLICATION FILED NOV. 20. 1916.

Patented Oct. 21, 1919.

2 SHEETS-SHEET 1.

g INVE/VTUR wear/w fl fludlsorz 7) 1 A TTOR/VEY CHARLES N. HUDSON, OF SEATTLE, WASHINGTON.

GRADER.

Specification of Letters Patent.

Patented Oct. 21, 1919.

Application filed November 20, 1916. Serial No. 132,476.

To all whom it may concern:

Be it known that I, CHARLES N. HUDSON, citizen of the United States, residing at Seattle, in the county of King and State of l Vashington, have invented a certain new and useful Improvement in Graders, of which the following is a specification.

My'invention relates to improvements in graders of that class which is employed for separating gold from the gold bearing earthy material of gold placer mines, and the object of my invention is to provide a concentrator which shall be of such plan of construction as will adapt it to he associated with w dredge placed on a gold placer mine and to have a capacity to operate upon all of the earthy material extracted from said mine at the same rate that said material is extracted from said mine by said dredge; and a further object of my invention is to construct such concentrator so that it will be adapted efficiently to operate to wash and eliminate all of the larger stones and boulders of the earthy material deposited in the concentrator, then to wash and eliminate smaller stones thereof and finally to wash and eliminate, all of the valuless lighter earthy material and retain only the heavier concentrates of black sand and gold.

I accomplish these objects by devices illustrated in the accompanying drawings where- 1n- Figure 1 shows a grader omhodying my invention by a view in vertical mid-section on broken line w, 00 of Fig. 2.

Fig. 2 is a view of the same in vertical cross-section on broken line 3 g of F ig. 1;

Fig. 3 is a fragmentary view in end elevation showing some associated partsof the same; and

Fig. 1 is a. fragmentary view in crosssection on broken line 2, a of Fig. 2 showing some details of the same.

Referring to the drawings, throughout which like reference numerals designate like parts, 6, 7 and 8 are transversely disposed supporting sills to respective ones of which are secured vertical studs 9, 10 and 11 to form one side of a frame, the other side of said frame being formed by other studs, only two of which, as stud 12 in Fig. 2 and the stud 13 in Fig. 3, are shown, the stud 12 being on the sill 7 opposite the stud 10, and the stud 13 being opposite the stud 9 on the sill 6, the side studs 9, 10 and 11 and the oppositely disposed side studs, including the studs 12 and 13, being rigidly connected by boards lat and 15, respectively, which are fastened to the lower portion of the outer side surfaces of said studs to extend in a lengthwise direction of said frame.

The opposite end portions of all of the transversely disposed sills 6, 7 and S are extended outwardly beyond each of the boards 14l= and 15 and fastened upon the top surfaces of said outwardly extended portions are lon gitudinally extending boards 16 and 17, respectively, said transverse sills 6, 7 and 8.

Fastened to the top surface of the outer edge portion of each of the boards 16 and 17 is a. board, as boards 18 and 19 respectively, which hoards extend throughoutthe length of the frame and which conjointly, with the boards 1 1 and 15 respectively, serve to support sluice boxes 20 and 21, respec tively, within which sluice boxes are disposed, as shown more clearly in Fig. 4:, riffle bars 22, 23 and 24 of well known form, said sluice boxes 20 and 21 being disposed lengthwise of the frame directly above the boards 16 and 17, respectively, extending lengthwise of the frame and fastened to the top end portions of the oppositely disposed side studs are top side rails, like the top side rail 25 shown in Fig. 1 as being secured to the studs 9, 10 and 11.

I Extending from each of the studs 9, l0 and 11 to respective ones of the oppositely disposed studs are transverse cross-beams, as the top cross-beams 26, 27 and 28, and intermediate cross-beams 29, 30, 31, 32 and 33, thus to complete a rigid frame.

Mounted on the cross-beam 29 and spaced from each other are two shaft bearings 34: and 35, and mounted on cross-beam 30 at corresponding points are similar shaft bearings, as the shaft bearings 36 and 37 indicated by dotted lines in Fig. 3, the hearing 36 being disposed with its axis in line with the axis of the hearing 34, while the bearing 37 is disposed with itsaxis in line with the axis of the bearing 35.

Rotatably mounted. in the bearings 34: and 36 isashaft 3S, and rotatably mounted in the bearings 35 and 37is a similar shaft 39.

The cross-beam 29 is at a higher elevation than the cross-beam 30 so that the axes of the shafts 3S and 39 both extend in the same inclined plane between. the cross-beam 30 and the cross-beam 29. V Y

Securely mounted on each of the shafts 38 which serve rigidly to connect and 39 is a cylinder, as cylinders 40 and 41, each of which is provided with spiral fins, as the fins 42 and 43 respectively.

The distance between ,the axes of the shafts 38 and 39 and the diameter of the cylinders 40 and 41 are such as will permit stones of a desired maximum size to fall therebetween while preventing stones of a large size from falling therebetween.

The fins 42 of the cylinder 40 are disposedto form a left hand spiral, while the fins 43 of the cylinder 41 are disposed to form a right hand spiral whereby, if the shafts 38 and 39 are being rotated in the opposite directions indicated by the arrows shown in Fig. 2, when earthy material is conducted to a point where it may fall through the space between the cylinders 40 and 41, then any stonesor boulders which are contained in such earthy material, and which are too large to'pass downwardly between said cylinders 40 and 41, will be engaged by the spiral fins 42 and 43 to be forced and conveyed thereby to and over higher ends of said cylinders 40 and 41 into a chute 44 which will conduct such large stones into the higher end of a transversely disposed chute 45 which may be extended .to a. desired distant point of disposal of said large stones and boulders. V

Earthy material of a placer mine may be conducted to the point where it may fall through said space between the cylinders 40 and 41 by means of a chute 46 into which said earthy material may be deposited by any one of numerous well known means not shown. a

All of the larger stones and boulders of said earthy material'that are conveyed by the spiral fins 42 and 43 into the chute 44, during their movement toward said chute 44, will be thoroughly washed by showers of water from perforated pipes, like the pipe 47, disposed above the'space between the cylinders40 and 41, which pipes may lead to a source of water not shown, which showers of water will remove any earthy matter that may be adhered to said stones andboulders and cause it to-fall through said space with the smaller stones and the other earthy material, whereby said large stones and boulders, when they drop into the chu'te44, will be devoid of all metal bearing earthy matter.

Disposed on cross-beam 31 are two spaced shaft bearings 48 and 49, as indicated by dotted lines in Fig. 3, and disposed on crossbeam 32 are two correspondingly disposed bearings, only the bearing 50 of which is shown, the axes of the bearings 48 and 50 being in the same line, while the axes of the bearing 49 and the corresponding bearing (not shown) on cross-beam 31 are both in another line that is parallel with theaxes of the bearings 48 and50.

Rotatably mounted in the bearings 48 and 50 is a shaft 51 and rotatably mounted 1n the bearing 49 and in the corresponding.

bearing (not shown) on the cross-beam 32 is a similar shaft 52, and upon each of said shafts 51 and 52 is rigidly'mounte-d a cylinder, as cylinders 53 and 54 respectively, both of which cylinders 53 and 54 are provided with left hand and right hand spiral fins 55 and 56, respectively, said cylinders 53 and 54 being of lengths and dispositions to extend horizontally throughout almost the entire distance between the cross-beams 31 and 32.

The distance between the of the shafts 51 and 52 and the diameter of the cylinders 53 and 54 are such that the space between the cylindrical surfaces of said cylinders 53 and 54 is considerably narrower than is the space between the cylinders 40 and 41', the latter space being directly over said space between said cylinders 53 and 54 whereby all earthymatter falling through the space between said cylinders '40 and 41 will drop into the space between said cylinders 53 and 54; and thus all stones of such earthy matter that are too large to drop through the space between the cylinders 53 and 54 will be washed clean by the shower of water from the perforated pipes like the pipe 47 as, in response to rotations of said cylinders 53 and 54 in directions indicated by arrows in Fig. 3, they are forcibly conveyed by the fins 55 and 56 to and over the ends of said cylinders 53 and 54, adjacent to the crossbeam 32, there to drop into .a chute 57 that may be extended to a desired point of disposal not shown.

Directly under the cylinders 53 and 54 is a trough 58 one end of which is supported by the cross-beani 33 and the other end of which is supported by suspension brackets 59, that are secured to the under side of the cross-beam 30 and said trough 58 is so formed and disposed that it declines from its closed end on the cross-beam 33 to its open end that is suspended from said brackets 59, whereby all earthy material that falls through the space between the cylinders 53 and 54 will drop .into said trough 58 to be carried by the shower of water from the pipes, like the pipes 47,

down the declining floor of said trough 58' and the lower end of said cradle 60 is provided with a pivot 63 which is rotatively movable in a supporting bracket 64: that is secured to a cross-board 65 as shown more clearly in Fig. l.

The semi-circular wall of the cradle 60 is perforated with numerous holes, like the 7 gold bearing matter mixed with holes 66, and is further provided with a large outlet opening through the bottom of its lower end portion, whereby the liner, heavier and all-gold bearing portions of all the earthy matter that drop through the space between the cylinders 53 and 5 i'into said cradle 60 will be sifted through said numerous holes 66 in response to reciprocal rotative or oscillating movements of said cradle 60, aidedby the action of the Water from the perforated pipes like the pipe 47, and whereby the 'valueless lighter and coarser earthy matter is carried by gravity and water to and through the opening in the bottom of the lower end of said cradle 60 to fall into a compartment 67 of a receptacle 68 disposed adjacent to the inner side of the transverse sill 6, while said finer, heavier and all gold bearing portions of said earthy matterthat is sifted through the numerous holes 66 in said cradle 60 will drop into a trough 69, of semi-circular cross-section which is disposed beneath the cradle 60 in an inclined position to conduct such finer water into another compartment 70 of said receptacle 68.

As indicated by dotted lines in Fig. 1, the receptacle 68 is divided into said two compartments 67 and 70 by a transverse partition 71, and said two compartments 67 and 70 are provided each with a bottomthat slopes downwardly in opposite transverse directions from its central highest point to its lowest point, as shown with re spect to the compartment 70 in Fig. 2 where the numeral 72 designates the floor bottom sloping in both directions from its highest central point, whereby earthy matter falling from the trough 69 into the compartment 70 will be divided into two portions, one portion being disposed on each side of the central portion of the floor bottom; and whereby earthy matter falling from the cradle 60 will drop into the compartment 67, and in a like manner be divided into two portions, one portion on each side of the center of the floor bottom.

The valueless-lighter and coarser earthy matter that is deposited in the compartment 67 on each side of its higher portion is removed therefrom by a bucket and chain conveyer 73, of well known form, which extends obliquely upward therefrom in a position to raise and deposit said earthy matter into a chute 74 which may lead to any convenient point of disposal of said valueless earthy matter.

The finer, heavier and gold bearing portions of the earthy matter that are deposited in the compartment 70 on each side of its higher central portion are removed therefrom by similar bucket and chain conveyors 75 and 76 which extend obliquely upward therefrom, as shown more clearly in i ig, 2, and which carry said gold bearing earthy matter upward and deliver it to fall into sluice boxes 20 and 21, respectively, which sluice boxes 20 and 21 may be provided with a sluice head of water by any well known means, whereby gold bearing earthy matter may be washed over the rifl'les 22, 23, and 2 1-, in a well known manner duringwhich operation all the gold contained in said earthy matter will be caught and retained by the rillle-bars of said riflie, while the worthless portions of the material is carried to the tailing pile at the ends of said sluice boxes 20 and 21 in an obvious manner.

Mounted on the outer end portion of the shaft 51 is a pulley 77 on which is mounted a belt 78 that may be extended to a source of rotary motion, not shown, and also mounted on said outer end portion of said shaft 51 is a gearwheel 79 which engages with an idler pinion 80 that is mounted on a stud 81 secured to the crossbeam 30.

The idler pinion 80 is disposed to engage with another gearwheel 82 which is mounted on the outwardly projecting end of the shaft 38. a

Mounted on the outwardly projecting end of the shaft 52 is a gearwheel which engages with a gearwheel 79 and with an idler pinion 84: that is mounted on a stud 85 that is fixed on the cross-beam 30, and said idler pinion 84; is disposed to engage with a gearwheel 86 that is mounted on the outwardly projecting end of the shaft 39.

Thus, rotary motion communicated to the shaft 51 by the belt 78, traveling in the direction indicated by the arrow adjacent thereto, will cause the cylinders 54, 53, 41

and 40 to revolve in the respective direc- V tions indicated by the arrows shown in Figs. 2 and 3.

Attached to the outwardly projecting pivot shaft 61 of the perforated cradle 60, is a crank 87, whose crank pin 88 may be articulated to means, not shown, whereby reciprocal rotative movements may be com municated to the perforated cradle 60 thereby to agitate the contents thereof in an obvious manner.

The operation of the structure thus illustrated and described will be obvious to those skilled in the art, it being only necessary to supply means for actuating the belt 78 and means for actuating the bucket and chain conveyers 7 3, 7 5 and 7 6 together with means for actuating the crank 87 and for supplying water to the sluice boxes and to the material of a placer gold mine may be deposited and fed into the chute 46 to fall therefrom into the space between the cylin ders and 41, the fins of which cylinders 40 and ll will convey the large stones into the chute A wherefrom they will pass into the chute 45, while the smaller stones and earthy material will fall through said space into the space between the cylinders 53 and 54 which, in an obvious manner, will eliminate all stones that will not pass through said latter space, while such earthy material as falls through said latter space will drop into the inclined trough 58 to be conveyed thereby into the upper end of the perforated cradle 60 whose agitation will cause the finer, heavier and all gold bearing portions of said earthy material to sift through the perforations thereof and fall into the trough 69 which will conduct such gold bearing portions into the compartment 70 of the receptacle 68, while the coarser valueless portion of the earthy material will find its way through the opening in the lower end of the cradle 60 to fall into the compartment 67 from which it will be conveyed by the bucket and chain conveyers, like the bucket and chain conveyer 7 3, into chutes, like the chute 74, to be conducted thereby to a tailing pile; while the finer gold bearing portion of the earthy material will be removed from the compartment 70 by the bucket and chain conveyers 7 5 and 7 6 to deposit such gold bearing material into the respective sluice boxes 20 and 21, the several rifiies of which will catch and retain all of the gold contained in said earthy material in an obvious and well known manner.

Manifestly, changes may be made in the forms, dimensions and arrangement of parts of my invention without departing from the spirit thereof. 7

What I claim is:

In a grader, a supporting frame, a feeding chute at one endof said frame, a delivery chute centrally of said frame, a second delivery chute at the end of said frame remote from said feeding chute, a pair of spaced cylinders journaled in said frame between and adjacent to said feeding and cen tral delivery chute, said cylinders inclining upwardly from their receiving to their delivery ends, means for advancing material along said cylinders, a second pair of spaced cylinders journaled in said frame beneath said first named pair of cylinders, said second pair of cylinders extending throughout.

the entire length of said frame, means for feeding material along said second cylinders, the space between said second pair of cylinders being less and in vertical aline ment with the space between said first named pair of cylinders, so that the material dropping through the space formed by the first named cylinders may be carried along by said second cylinders to the end delivery chute, and means common toall of said cylinders for causing their rotation.

In witness whereof, I hereunto subscribe my name this 14th day of November A. D. 1916.

CHARLES N. I'IUDSON.

WVitnesses.

FRANK WARREN, Geo. BLAIR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

